Real-time observation of stress-induced domain evolution in a [011] PIN-PMN-PT relaxor ferroelectric single crystal. (15th August 2019)

• Record Type: Journal Article
• Authors: Liu, Ying; Xia, Junhai; Finkel, Peter; Moss, Scott D.; Liao, Xiaozhou; Cairney, Julie M.
• Is Part Of: Acta materialia. Volume 175(2019)
• Page Start: 436
• Page End: 444
• Publication Date: 2019-08-15
• Subjects: Relaxor ferroelectric -- Compression -- Phase transition -- Ferroelectric domain -- Transmission electron microscopy; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2019.06.023
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: This paper reports on the real-time observation of mechanical stress-induced micro and nano domain evolution in a single crystal relaxor ferroelectric [011] poled 24PIN-PMN-PT "3-2 mode" nano-sized lamella. Mechanical loading in the [100] direction was applied to lamella in situ within a transmission electron microscope, with a [ 0 1 ¯ 1 ] viewing direction selected for the recording of real-time videos of the domain evolution within the lamella. The observed dominant behaviour under loading is a reversible response composed of the movement of microdomains and the disappearance of nanodomains. Changes in the selected area diffraction pattern down the [ 0 1 ¯ 1 ] zone axis are reported, and provide evidence of a significant increase in crystal symmetry under compression. A qualitative insight into the behaviour of the lamella's mechanical response is obtained via predictions of the non-uniform stress distribution within the lamella found using simple finite element analysis. The correlation between the observed morphology changes, diffraction pattern changes, and the known mechanical stress induced polydomain-rhombohedral to monodomain-orthorhombic phase transition of bulk [011] poled 24PIN-PMN-PT "3-2 mode" single crystal is discussed. Graphical abstract: Image 1